Today in History: Yellow Fever

Today in History–August 27–the Library of Congress features the discovery that mosquitos transmit yellow fever by U.S. Army physician James Carroll and pathologist Walter Reed on this day in 1900. The discovery was made because Carroll allowed allowed an infected mosquito to feed on him, resulting in severe yellow fever sickness. Learn more about yellow fever by visiting the Today in History section, then click the links below to access more related primary sources.